add opensmtpd and ipv6tunnel hosts from krov

hosts/krov/opensmtpd12/crontab

@@ -0,0 +1,3 @@
+0 2 * * * scp -r dmzkrovsshfs12:/var/shareddirs/nginx12opensmtpd12/krov.dmz.rs /etc/letsencrypt/live/
+1 2 * * * chmod 600 /etc/letsencrypt/live/krov.dmz.rs/privkey.pem
+2 2 * * * /sbin/service opensmtpd restart

hosts/krov/opensmtpd12/etc/mailname

@@ -0,0 +1 @@
+krov.dmz.rs

hosts/krov/opensmtpd12/etc/smtpd.conf

@@ -0,0 +1,28 @@
+#	$OpenBSD: smtpd.conf,v 1.10 2018/05/24 11:40:17 gilles Exp $
+
+# This is the smtpd server system-wide configuration file.
+# See smtpd.conf(5) for more information.
+
+table sendcreds file:/etc/sendcreds
+table aliases file:/etc/aliases
+
+filter "dkimsign" proc-exec "filter-dkimsign -d krov.dmz.rs -s selector1 -k /etc/dkim/selector1.private"
+
+pki krov.dmz.rs cert "/etc/letsencrypt/live/krov.dmz.rs/fullchain.pem"
+pki krov.dmz.rs key "/etc/letsencrypt/live/krov.dmz.rs/privkey.pem"
+
+# To accept external mail, replace with: listen on all
+#
+listen on eth0
+listen on eth0 port 587 auth sendcreds tls-require pki "krov.dmz.rs" filter "dkimsign"
+
+#action "local" maildir alias <aliases>
+action "relay" relay
+action "backup" relay backup
+
+# Uncomment the following to accept external mail for domain "example.org"
+#
+# match from any for domain "example.org" action "local"
+#match for local action "local"
+match from any for domain dmz.rs action "backup"
+match from auth for any action "relay"